Slide lock apparatus for press machine

Abstract

A slide lock apparatus for a press machine includes: a flange member fixed over the shaft member for driving the slide, and having a flange portion; an annular main member fixed to the main frame, and having an annular member facing the flange portion; a plurality of reception holes formed in the annular member; a plurality of pin members installed in the plurality of reception holes so as to be shiftable therein; a plurality of actuators for driving the plurality of pin members between retracted positions and advanced positions penetrating into admission holes in the flange portion; a first locking member for locking the plurality of pin members in retracted positions; a first drive device for rotationally driving the first locking member; a second locking member for locking the plurality of pin members in their advanced positions; and a second drive device for rotationally driving the second locking member.

The invention claimed is: 
     
       1. A slide lock apparatus for a press machine that locks a shaft member that rotates together with raising and lowering operation of a slide that is supported on a main frame of the press machine, so that the shaft member cannot rotate, comprising:
 a flange member fixed over an exterior of the shaft member so as to be incapable of rotation with respect thereto, and having a flange portion that is parallel to a plane orthogonal to an axis of the shaft member; 
 an annular main member fitted over the exterior of the shaft member and fixed to the main frame, and having an annular member that opposes the flange portion from a side of the main frame; 
 a plurality of pin members, respectively shiftably installed in a plurality of reception holes that are formed in the annular member parallel to the axis of the shaft member; 
 a plurality of actuators for driving the plurality of pin members between a retracted position in which the plurality of pin members are held in the reception holes and an advanced position in which predetermined end side portions are advanced out from the plurality of reception holes; 
 a plurality of receiving holes receiving the predetermined end side portions of the plurality of pin members when the plurality of pin members are in their advanced positions, formed in the flange portion with setting spaces between them in a circumferential direction, and shaped as circular arcs in cross section with an arc length in the circumferential direction being greater than a diameter of the plurality of pin members; 
 a plurality of locking engagement portions formed respectively at end portions of the plurality of pin members; 
 an annular first locking member capable of locking the plurality of pin members in their retracted positions via a plurality of first locking portions that are capable of engaging and disengaging with the plurality of locking engagement portions of the plurality of pin members from the circumferential direction respectively, when the plurality of pin members are in their retracted positions; 
 a first drive means capable of rotationally driving the annular first locking member around the axis of the shaft member between a locking position in which the annular first looking member locks the plurality of pin members in their retracted positions, and an unlocking position; 
 an annular second locking member capable of locking the plurality of pin members in their advanced positions via a plurality of second locking portions that are capable of engaging and disengaging with the plurality of locking engagement portions of the plurality of pin members from the circumferential direction respectively, when the plurality of pin members are in their advanced positions; and 
 a second drive means capable of rotationally driving the annular second locking member around the axis of the shaft member between a locking position in which the annular second locking member locks the plurality of pin members in their advanced positions, and an unlocking position. 
 
     
     
       2. A slide lock apparatus for a press machine according to  claim 1 , further comprising:
 an auxiliary main member that opposes the flange portion from an opposite side to the plurality of reception holes and that is fixed to the annular main member, and a plurality of support holes that are formed in the auxiliary main member and into which end side parts of the plurality of pin members can be inserted; and 
 wherein the auxiliary main member is so constructed that, when the pin members are shifted to their advanced positions, the end side parts of the pin members passed through the receiving holes are inserted into corresponding ones of the support holes. 
 
     
     
       3. A slide lock apparatus for a press machine according to  claim 2 , wherein the second locking member is disposed in a position adjacent to an end surface of the auxiliary main member on an opposite side thereof to the flange member. 
     
     
       4. A slide lock apparatus for a press machine according to  claim 1 , wherein the first locking member is disposed in a position adjacent to an end surface of the flange portion of the annular member. 
     
     
       5. A slide lock apparatus for a press machine according to  claim 1 , further comprising a first detection means that detects whether a position of the first locking member is its locking position or its unlocking position, and a second detection means that detects whether a position of the second locking member is its locking position or its unlocking position. 
     
     
       6. A slide lock apparatus for a press machine according to  claim 1 , wherein the actuators are built as double acting type fluid pressure cylinders, respectively, and the pin members are constituted by rod portions of piston rod members of the fluid pressure cylinders, respectively. 
     
     
       7. A slide lock apparatus for a press machine according to  claim 6 , wherein:
 the fluid pressure cylinders comprise forward acting fluid chambers for advancing the piston members and backward acting fluid chambers for retracting the piston members; and 
 the plurality of forward acting fluid chambers of the plurality of fluid pressure cylinders are connected to a single common first port for fluid pressure supplying/venting, and the plurality of backward acting fluid chambers of the plurality of fluid pressure cylinders are connected to a single common second port for fluid pressure supplying/venting. 
 
     
     
       8. A slide lock apparatus for a press machine according to  claim 1 , wherein the first drive means comprises at least one fluid pressure cylinder that drives the first locking member toward its unlocking position, and at least one tension spring that biases the first locking member towards its locking position. 
     
     
       9. A slide lock apparatus for a press machine according to  claim 1 , wherein the second drive means comprises at least one fluid pressure cylinder that drives the second locking member toward its unlocking position, and at least one tension spring that biases the second locking member towards its locking position. 
     
     
       10. A slide lock apparatus for a press machine according to  claim 1 , wherein the first locking member comprises: a first annular plate member parallel to a plane orthogonal to the axis of the shaft member; a plurality of through holes formed in the first annular plate member so as respectively to correspond to the plurality of pin members and having widths in the circumferential direction that are greater than the diameter of the pin members; and a plurality of first locking portions that are constituted by plate portions at one end in the circumferential direction of the plurality of through holes. 
     
     
       11. A slide lock apparatus for a press machine according to  claim 1 , wherein the second locking member comprises: a second annular plate member parallel to a plane orthogonal to the axis of the shaft member; a plurality of through holes formed in the second annular plate member so as respectively to correspond to the plurality of pin members and having widths in the circumferential direction that are greater than the diameter of the pin members; and a plurality of second locking portions that are constituted by plate portions at one end in the circumferential direction of the plurality of through holes. 
     
     
       12. A slide lock apparatus for a press machine according to  claim 1 , wherein the predetermined end side portions of the plurality of pin members are capable of entering into the plurality of receiving holes when the plurality of pin members are in their advanced positions and when the shaft member is in any rotational phase.